5GQR:
reference: SERK Family Receptor-like Kinases Function as Co-receptors with PXY for Plant Vascular Development., Zhang H, Lin X, Han Z, Wang J, Qu LJ, Chai J, Mol Plant. 2016 Oct 10;9(10):1406-1414. doi: 10.1016/j.molp.2016.07.004. Epub, 2016 Jul 21. PMID: 27449136

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